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1
Content available Convergence technology for vehicle part surface finishing
Sikulskiy Valeriy, Maiorova Kateryna, Vorobiov Yurii, Fomichev Petro, Myronova Svitlana
Transport Problems
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2023
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T. 18, z. 1
117--127
EN
The subject of this research is convergence technology for the surface finishing of vehicle parts. A literature review has been conducted to carry out a comparative analysis of existing methods for the surface finishing of parts used in the manufacturing of aircraft, hydraulic and pneumatic devices, and other vehicles. Prospects are shown for further research on methods with the aim of creating a complex technology (i.e., convergence) that combines information technologies; nanotechnologies; and thermochemical, electrochemical, and mechanical processing methods. A method is proposed for selecting and combining surface finishing methods according to a five-point expert assessment, which allows the batch processing of vehicle parts. Based on this method, the concept of convergence technology for the surface finishing of vehicle parts is proposed, which includes the impulse thermal energy method, honing, superfinishing, and electrochemical processing. An expanded process is presented for manufacturing parts with high-precision, low-roughness surfaces and a specified microrelief by using electrochemical superfinishing and electrochemical honing. A scheme of the concentration (focusing) of the current flow during electrochemical superfinishing due to the movement of the electrode relative to the part surface is proposed, which enables the effect of surface polishing and the removal of oxidation products. Convergence technology for the surface finishing of vehicle parts will provide parts’ geometric dimensions with micro- and nano-precision and allow the precision machining of small-diameter holes and complex profiles, increased machining accuracy (up to 0.001 microns), the possibility of batch processing, and the possibility of process automation.
2
Content available Simulation of Superfinished Surface Formation
Görög Augustín
Advances in Science and Technology. Research Journal
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2021
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Vol. 15, no 2
219--227
EN
The article deals with the simulation of single-oscillating grooves superfinishing. A model of the superfinishing tool was created according to the input information about the tool and the superfinishing process. Using this tool, a simulation of the cutting process was performed. The input parameters for the simulation were the cutting conditions, which determined the paths of tools individual grains (process kinematics). The simulation is realized by gradual removal of the workpiece material by individual grains of the tool. The result of the simulation is the profile of the superfinished surface at an evaluation length of 1.25 mm. It is possible to determine the surface roughness parameters from the profile. Creating and displaying multiple profiles side by side creates a graphical model of the superfinished surface. The simulation can be used for numerical simulation experiments, where both material and energy are saved. The article presents one such experiment together with the results – the surface roughness was influenced by individual factors. The simulation results (surface roughness parameters and surface appearance) were compared with the real superfinished surface on the outer ring of the bearing. This surface was manufactured under mass production conditions. The comparison confirmed that a simulation is a suitable tool for research of abrasive machining methods. At the end of the article is a discussion about a possible improvement of the simulation - considering 3D grains of the tool.
3
Content available remote Technological parameters of belt grinding process of hard steel
Hamdi A., Aliouane T., Bouzid D.
Mechanics and Mechanical Engineering
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2017
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Vol. 21, nr 4
843--853
EN
A mechanical workpiece in the field of the automobile industry (crankshaft, camshaft, valves, gear, synchronizer gearbox ... etc) is good quality, if it fulfills the function for which, it is destined. To ensure the required function of these workpieces, they are necessary for the purpose of machining a high precision superfinishing process. There are several methods of superfinishing in this area, for example: honing, polishing, belt grinding ... etc. The belt grinding is a mechanical manufacturing process by removing of material involving a tool called abrasive belt. It is complementary to the hard turning and recent compared to other process principle and objective. To date the cutting mechanism and its exact effect on the surface integrity remains unclear. This study allows optimizing the technological parameters, such as time of belt grinding, size of the abrasive grains, the rotation speed and lubrication, and seeing the influence of these parameters on the surface state of the hard steel.
4
Content available remote Obróbki powierzchniowe jako obróbki wykańczające
Morek R.
Stal, Metale & Nowe Technologie
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2015
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nr 11-12
36--38
PL
Obróbki wykańczające są niezbędne, by możliwe było zrealizowanie jakościowych wymagań dotyczących wykańczającego etapu obróbki (dokładność geometryczna, chropowatość powierzchni). Nie zawsze tego typu techniki wytwarzania muszą być jednak wykorzystywane. W niniejszym artykule skupię się na analizie zalet i wad poszczególnych obróbek wykańczających.
5
Content available Sposoby intensyfikacji dogładzania oscylacyjnego
Mikołajczyk T.
Inżynieria i Aparatura Chemiczna
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2014
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Nr 2
93--95
PL
W pracy przedstawiono opracowane w Zakładzie Inżynierii Produkcji Uniwersytetu Technologiczno Przyrodniczego w Bydgoszczy sposoby intensyfikacji dogładzania oscylacyjnego poprzez komputerowe sterowanie częstotliwością drgań osełki oraz poprzez zastosowanie dogładzania hybrydowego, elektrochemiczno-ściernej techniki usuwania naddatku obróbkowego.
EN
Methods of superfinishing process intensification using the computer control of whetstone oscillation frequency and through the application of electrochemical-abrasive hybrid technology for machining allowance removal developed at the Department of Production Engineering at the University of Technology and Life Sciences in Bydgoszcz are presented in the paper.
6
Content available Effect of superfinishing methods kinematic features on the machined surface
Kacalak W., Tandecka K.
Journal of Machine Engineering
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2012
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Vol. 12, No. 4
35--48
EN
The carried out research of the processes for the treatment of superfinishing with the application of microfinishing films of IMFF type with heaping the grain from the alundum with the nominal size of 15 micrometers for the different cinematic system proved that the topography of surface after smoothening depends on the cinematic features of process. It is demonstrated that the machining with oscillation can be substituted and the similar effects can be obtained as a result of the deviation from the parallelism of the directions of object feed and foil feed. This means the possibility to apply the super finisher attachments with a simpler building.
7
Content available Basics of the superfinishing results prognostication by the diamond lapping films
Kacalak W., Tandecka K.
Journal of Machine Engineering
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2012
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Vol. 12, No. 4
49--62
EN
Superfinishing with the use of diamond lapping films differs to a significant extent from other machining methods. This is finishing surface machining, one which is realized by a slow rewinding of a microfinishing film, putting it in an oscillating motion and pressing the tool to the surface being machined. The surface being machined moves with a speed which is substantially greater than that of the tool feed. A characteristic feature of the process is a one-time use of the tool, the result being a need of an optimal selection of the machining parameters. Investigations of the topography of the microfinishing film surface were conducted with the use of new parameters that describe the arrangement and the shape of the vertices of active grains. The following were used for the purpose of assessment: coefficients that had been developed that describe the features of the shape of the tool surface, such as the standardized coefficient of the flatness of vertices wNki, the standardized number of vertices in relation to an area unit LNwi and the dissipation coefficient of the height of the location of vertices wNrwi. For the purpose of the assessment of the smoothening ability of diamond lapping films the smoothening potential coefficient wp was developed, which is defined as the geometric mean of the abovementioned indices.
8
Content available Analysis of surface roughness on bearing steel parts after cutting, superfinishing and burnishing operations
Neslusan M., Grzesik W., Żak K.
Journal of Machine Engineering
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2012
|
Vol. 12, No. 1
111--118
EN
The different technological operation can form the variety of surface with the different functionality. In this paper the surface texture produced by hard turning of a quenched 100Cr6 steel of 62-64 HRC hardness using mixed ceramic (MC) tools and subsequent superfinishing and multipass burnishing operations is characterized by means of a number of roughness parameters. Both conventional and wiper MC cutting tool inserts were employed. The main objective of this study is to improve service properties of the turned surfaces of bearing parts by additional removal and non-removal treatments in order to obtain smoother surfaces with lower surface roughness and better bearing characteristics.
9
Content available remote Doskonalenie procesów obróbki ściernej. Cz. IV. Gładzenie, dogładzanie i obróbka luźnym ścierniwem
Oczoś K. E.
Mechanik
|
2010
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R. 83, nr 11
783-793
PL
Doskonalenie procesów i urządzeń do gładzenia i dogładzania oscylacyjnego. Doskonalenie procesu i urządzeń do obróbki przetłoczno-ściernej. Innowacyjne procesy i urządzenia do obróbki rotacyjno- i wibracyjno-ściernej.
EN
Improvements to processes and tools designed for honing and superfinish operations. Improvements to processes and tools designed for the abrasive flow machining process. Innovative processes and tools for rotary/vibration abrasive machining.
10
Content available remote Dwuwymiarowa charakterystyka chropowatości powierzchni po obróbce stali w stanie utwardzonym
Brol S., Wanat T.
Archiwum Technologii Maszyn i Automatyzacji
|
2003
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Vol. 23, Nr 2
15-24
PL
Chropowatość powierzchni jest jedną z najważniejszych charakterystyk jakości części maszyn. W artykule opisano profile chropowatości powierzchni generowanych w wyniku toczenia, szlifowania i dogładzania oscylacyjnego próbek ze stali 40H zahartowanej do 60 HRC. Porównano wartości następujących parametrów chropowatości zdefiniowanych w normie ISO 4287: Ra, Rz, Rl, Rsm, R(deltaq), Rmr, R (deltaq) i R(Lambdaq) określających pionowe i poziome cechy profilu oraz jego kształt i rozkład rzędnych. Zakres analizy poszerzono o parametry Rk, Rpk i Rvk związane z krzywą udziału materiałowego. Wyniki badań i porównania mogą posłużyć jako wytyczne do projektowania procesu technologicznego w celu uzyskania określonej jakości powierzchni.
EN
The surface roughness of a machined part is one of its most important quality characteristics. This paper attempts to make a contribution to surface roughness generation when turning, grinding and superfmishing of hardened steel. For this purpose tests were carried out using hardened (about 60 HRC) low chromium steel bars. A set of surface roughness parameters specified in ISO 4287, including such parameters as Ra, Rz, Rl, Rsm, Rdeltaq, RLaqmbdaq, Rmr, Rk, Rpk, Rvk, Rst and Rku, was selected and the measured values of the roughness parameters were analysed in terms of cutting conditions. As a result, vertical, horizontal, peak shape and amplitude parameters were determined for machining processes with geometrically defined and undefined cutting edges. In particular, the comparison between profile characteristics obtained for hard turning, grinding and superfinish was done in order to establish the optimum process conditions.
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